A good Scrum overview is hard to find even though there are many of them out there. Here is one that might be useful next time your waterfall manager wants to know, "What is Scrum?"
Agile Software Engineering Management
Dan Greening, Citrix Online
Scrum is a software management technique with high transparency, adaptive control, reasonably accurate release forecasting, and high productivity. However, because Scrum exposes marketers and developers to greater visibility and accountability than traditional waterfall approaches, and because it requires different management structures, some organizations encounter resistance implementing it. Scrum focuses on management, so it can be combined with developer-focused agile techniques, such as Extreme Programming. More ...